Core Data keeps two objects instead 27 in fetchObjects

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First step: Upload from Json data(total of data = 27 objects) then i want keep all this objects in my Core Data; Second Step: After time period i checking my Json again for new objects. Compare Core Data objects count with Json objects count, if its different i going to add this objects to my Core Data. But my Core Data has a wrong objects count on the second step(2 objects in fetchObjects). In summary i would like to copy all objects from Json to my Core Data and each ten seconds i check for new objects in my Json. Here is my following code:

- (NSInteger) isNewData: (NSArray *) fetchedObjects
{
    ///////////json part
    NSURLRequest* urlRequest =  [NSURLRequest requestWithURL:[NSURL          URLWithString:getMessageURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
    NSData * data = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:nil error:nil];
    _json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
    ///////////core data part
    //NSManagedObjectContext *context = [self managedObjectContext];
    /*NSError *error;
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription
                               entityForName:@"Entity" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];*/
    /////////if part
    NSLog(@"%d",fetchedObjects.count);
    return _json.count - fetchedObjects.count;
}

- (void) loadDataToCoreDataFromJson: (NSInteger) odds andSecond: (NSManagedObjectContext *) context
{
    //core data connection
    Entity *newList = [NSEntityDescription
                   insertNewObjectForEntityForName:@"Entity"
                   inManagedObjectContext:context];
    newList = [NSEntityDescription insertNewObjectForEntityForName:@"Entity" inManagedObjectContext:context];
    for (int i = 0; i < odds; i++)//?
    {
        //NSManagedObjectContext *context = [self managedObjectContext];

        newList.login = [[_json objectAtIndex:_json.count - odds + i] objectForKey:@"login"];
        newList.message = [[_json objectAtIndex:_json.count - odds + i] objectForKey:@"message"];
        newList.date = [[_json objectAtIndex:_json.count - odds + i] objectForKey:@"date"];
        [context save:nil];
    }

}

- (void) loadDataFromCoreDataToArrays : (NSArray*) fetchedObjects
{
    _getDate = [[NSMutableArray alloc] init];
    _getMessage = [[NSMutableArray alloc] init];
    _getLogin = [[NSMutableArray alloc] init];
    ///////////core data part connection
    //NSManagedObjectContext *context = [self managedObjectContext];
    for (int i = 0; i < fetchedObjects.count; i++)
    {
        Entity * info = [fetchedObjects objectAtIndex:i];
        [_getLogin addObject:info.login];
        [_getMessage addObject:info.message];
        [_getDate addObject:info.date];
    }

}

- (void) chating
{
    AppDelegate* appDelegate = [UIApplication sharedApplication].delegate;
    NSManagedObjectContext *context = appDelegate.managedObjectContext;
    NSError *error;
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription
                               entityForName:@"Entity" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    NSInteger odds = [self isNewData: fetchedObjects]; //0 if no data, if > 0 then there are N new data;
    if (odds != 0)
    {
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
        [self loadDataToCoreDataFromJson: odds andSecond:context];
        [self loadDataFromCoreDataToArrays: fetchedObjects];
        [self reloadMyTableView];
    }
}

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    _buttonSend.enabled = NO;
    [self loadUserDefault];
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        _connects++;
        NSLog(@"return message");
        dispatch_async(dispatch_get_main_queue(), ^{
            [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(chating) userInfo:nil repeats:YES];
            [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(reloadMyTableView) userInfo:nil repeats:YES];
        });
    });
}

I think i doing wrong with Core Data. Thanks every body for help.

edited just now

rmaddy

74k

asked 24 secs ago

user3813671

1